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6008d9c94b
Summary: Allow extended parsing of variable assembler assignment syntax and modify X86 to permit VAR = register assignment. As we emit these as .set directives when possible, we inline such expressions in output assembly. Fixes PR37425. Reviewers: rnk, void, echristo Reviewed By: rnk Subscribers: nickdesaulniers, llvm-commits, hiraditya Differential Revision: https://reviews.llvm.org/D47545 llvm-svn: 334022
76 lines
2.1 KiB
C++
76 lines
2.1 KiB
C++
//=--- X86MCExpr.h - X86 specific MC expression classes ---*- C++ -*-=//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file describes X86-specific MCExprs, i.e, registers used for
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// extended variable assignments.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_LIB_TARGET_X86_MCTARGETDESC_X86MCEXPR_H
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#define LLVM_LIB_TARGET_X86_MCTARGETDESC_X86MCEXPR_H
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#include "InstPrinter/X86ATTInstPrinter.h"
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#include "llvm/MC/MCAsmInfo.h"
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#include "llvm/MC/MCContext.h"
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#include "llvm/MC/MCExpr.h"
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#include "llvm/Support/ErrorHandling.h"
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namespace llvm {
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class X86MCExpr : public MCTargetExpr {
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private:
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const int64_t RegNo; // All
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explicit X86MCExpr(int64_t R) : RegNo(R) {}
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public:
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/// @name Construction
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/// @{
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static const X86MCExpr *create(int64_t RegNo, MCContext &Ctx) {
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return new (Ctx) X86MCExpr(RegNo);
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}
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/// @}
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/// @name Accessors
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/// @{
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/// getSubExpr - Get the child of this expression.
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int64_t getRegNo() const { return RegNo; }
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/// @}
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void printImpl(raw_ostream &OS, const MCAsmInfo *MAI) const override {
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if (MAI->getAssemblerDialect() == 0)
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OS << '%';
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OS << X86ATTInstPrinter::getRegisterName(RegNo);
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}
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bool evaluateAsRelocatableImpl(MCValue &Res, const MCAsmLayout *Layout,
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const MCFixup *Fixup) const override {
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return false;
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}
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// Register values should be inlined as they are not valid .set expressions.
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bool inlineAssignedExpr() const override { return true; }
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void visitUsedExpr(MCStreamer &Streamer) const override{};
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MCFragment *findAssociatedFragment() const override { return nullptr; }
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// There are no TLS X86MCExprs at the moment.
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void fixELFSymbolsInTLSFixups(MCAssembler &Asm) const override {}
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static bool classof(const MCExpr *E) {
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return E->getKind() == MCExpr::Target;
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}
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};
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} // end namespace llvm
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#endif
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